# 240 Volt Circuits and Switches

 Electrical Wiring for 240 Volt Circuits and Switches: Each individual pole of a switch or circuit breaker are rated for the stated amperage, the rating is not a combined total of the number of poles.

### Generator Automatic Transfer Switch and Electric Circuit Sub Panel

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Understanding 240 Volt Circuits and Switches
[ad#block] Electrical Question: I purchased a 30Amp, double-pole single-throw switch for a 240Volt circuit dedicated to a steam humidifier for a home ventilation system.

• The circuit includes 45 feet of 12/3 copper wire and a 15A double circuit breaker.
• The humidifier which is an April Aire 800, will use 12.7A peak, 11.5A nominal.
• I’m assuming the switch will be sufficient but is it rated at 30A per line, or is 30A the sum of the maximum amperage for both lines?
• The switch manufacturer’s web site offered no information.

Thank you.

This electrical wiring question came from: Steve, a Homeowner from Damascus, Maryland.

Thanks for your electrical wiring question Steve.

Preparations for Wiring a 240 Volt Circuit

• Application: Wiring a 240 Volt Switch.
• Skill Level: Intermediate to Advanced – Best installed by a Licensed Electrician.
• Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester.
• Estimated Time: Depends on personal level experience and ability to work with tools.
• Precaution: Identify the circuit, turn it OFF andÂ  Tag it with a Note before working with the wiring.
• Notice: Installing additional electrical wiring should be done with a permit and be inspected.

Electrical Wiring for 240 Volt Circuits and Switches

• Steve, for your humidifier and ventilation system application you could use a 20 amp two-pole switch because the amperage is within the operating amperage range.
• Each individual pole of a switch or circuit breaker are rated for the stated amperage, the rating is not a combined total of the number of poles.

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You identified your project to be about 220 Volt Wiring Diagram, so you might find this information useful:

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## Dave's Guide to Home Electrical Wiring:

» You Can Avoid Costly Mistakes! «

Here's How to Do It:
Wire It Right with the help of my Illustrated Wiring Book

Great for any Home Wiring Project.

## Complete Guide to Home Electrical Wiring

Perfect for Homeowners, Students,
Handyman, Handy Women, and Electricians
Includes:
Wiring GFCI Outlets
Wiring Home Electric Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring Light Switches
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
How to Troubleshoot and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
NEC Codes for Home Electrical Wiring
....and much more.

Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.

## The Safest Way to Test Electrical Devices and Identify Electric Wires!

The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

## The Quickest Way to Check for Faulty Electrical Wiring!

The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.

## Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!

The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..

The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.

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